What I mean here by "transaction" semantics is not "transactional NTFS" (or the other distributed transaction engines that replaced it) but as a short hand for all the various different ways that file locking mechanics and file consistency guarantees are very different in NT/Windows/NTFS than in the POSIX "inode" model. All of that has a lot of complex moving parts (filter drivers are indeed one part of that complex dance both affecting and affected by Windows' file "transaction" semantics).
"Transaction" is a useful analogical word here for all of that complexity because how a mini-version of the CAP theorem trade-off space can be seen to apply to file systems. Windows heavily, heavily favors Consistency above all else in file operations. Consistency checks of course slow down file opening (and other operations too). POSIX heavily favors Availability above all else and will among other things partition logical files across multiple physical inodes to do that. Neither approach to "file transactions" is "better" or "perfect", they are different trade-offs. They both have their strengths and weaknesses. Using tools designed for one is always going to have some problems operating in the other. POSIX tools are always going look at Windows as "slow file IO" because it doesn't hustle for availability. Windows tools are always going to look at POSIX as willfully dangerous when it comes to file consistency. At the end of the day these filesystem stacks are always going to be different tools for different jobs.
"Transaction" is a useful analogical word here for all of that complexity because how a mini-version of the CAP theorem trade-off space can be seen to apply to file systems. Windows heavily, heavily favors Consistency above all else in file operations. Consistency checks of course slow down file opening (and other operations too). POSIX heavily favors Availability above all else and will among other things partition logical files across multiple physical inodes to do that. Neither approach to "file transactions" is "better" or "perfect", they are different trade-offs. They both have their strengths and weaknesses. Using tools designed for one is always going to have some problems operating in the other. POSIX tools are always going look at Windows as "slow file IO" because it doesn't hustle for availability. Windows tools are always going to look at POSIX as willfully dangerous when it comes to file consistency. At the end of the day these filesystem stacks are always going to be different tools for different jobs.